port 53 is already in use Update: What to do if port 53 is already in use When the Port 53 is already in Use, you can check this with this command (ubuntu): Port 53 is being used at your host machine, that's why you can not bind 53 to host. To find what is using port 53 you can do:  sudo lsof -i -P -n | grep LISTEN I'm a 99.9% sure that systemd-resolved is what is listening to port 53. To solve that you need to edit the  /etc/systemd/resolved.conf  and uncomment DNSStubListener and change it to no, so it looks like this:  DNSStubListener=no After that reboot your system or restart the service with  service systemd-resolved restart